﻿/*
 * BSD 3-Clause License
 *
 * Copyright (c) 2018-2021
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using size_t = System.UInt64;


namespace NumpyLib
{
    internal partial class numpyinternal
    {
        internal static int npy_array_getsegcount(NpyArray self, ref size_t lenp)
        {
            lenp = (size_t)NpyArray_NBYTES(self);
           
            if (NpyArray_ISONESEGMENT(self))
            {
                return 1;
            }
            lenp = 0;
            return 0;
        }

        internal static int npy_array_getreadbuf(NpyArray self, size_t segment, ref VoidPtr ptrptr)
        {
            if (segment != 0)
            {
                NpyErr_SetString(npyexc_type.NpyExc_ValueError, "accessing non-existing array segment");
                return -1;
            }
            if (NpyArray_ISONESEGMENT(self))
            {
                ptrptr = NpyArray_BYTES(self);
                return (int)NpyArray_NBYTES(self);
            }
            NpyErr_SetString(npyexc_type.NpyExc_ValueError, "array is not a single segment");
            ptrptr = null;
            return -1;
        }

        internal static int npy_array_getwritebuf(NpyArray self, size_t segment, ref VoidPtr ptrptr)
        {
            if (NpyArray_CHKFLAGS(self, NPYARRAYFLAGS.NPY_WRITEABLE))
            {
                return npy_array_getreadbuf(self, segment, ref ptrptr);
            }
            else
            {
                NpyErr_SetString(npyexc_type.NpyExc_ValueError, "array cannot be accessed as a writeable buffer");
                return -1;
            }
        }

    }
}
